[tracing] Expose AddOwnershipEdge and CreateAllocatorDump with guid to blink. (blink-side).

public/platform/WebProcessMemoryDump.h

Index: public/platform/WebProcessMemoryDump.h
diff --git a/public/platform/WebProcessMemoryDump.h b/public/platform/WebProcessMemoryDump.h
index bbc5b83e7e6b6cdfa8cc9a38b4bfc8a3d4dd312c..46be4b18a002fdb7f841024ffe590de1c4b0c8c3 100644
--- a/public/platform/WebProcessMemoryDump.h
+++ b/public/platform/WebProcessMemoryDump.h
@@ -7,11 +7,10 @@
 
 #include "WebCommon.h"
 #include "WebString.h"
+#include "public/platform/WebMemoryAllocatorDump.h"
 
 namespace blink {
 
-class WebMemoryAllocatorDump;
-
 // A container which holds all the dumps for the various allocators for a given
 // process. Embedders of WebMemoryDumpProvider are expected to populate a
 // WebProcessMemoryDump instance with the stats of their allocators.
@@ -43,6 +42,20 @@ public:
     virtual void takeAllDumpsFrom(WebProcessMemoryDump* other)
     {
     }
+
+    // Adds an ownership relationship between two MemoryAllocatorDump(s) with
+    // the semantics: |source| owns |target|, and has the effect of attributing
+    // the memory usage of |target| to |source|. |importance| is optional and
+    // relevant only for the cases of co-ownership, where it acts as a z-index:
+    // the owner with the highest importance will be attributed |target|'s
+    // memory.
+    virtual void AddOwnershipEdge(WebMemoryAllocatorDumpGuid source, WebMemoryAllocatorDumpGuid target, int importance)

[Primiano Tucci (use gerrit), 2015/05/29 11:24:53]

const WMADG& source (and target)

[ssid, 2015/05/29 15:50:48]

Done.

+    {
+    }
+
+    virtual void AddOwnershipEdge(WebMemoryAllocatorDumpGuid source, WebMemoryAllocatorDumpGuid target)
+    {
+    }
 };
 
 } // namespace blink